Downgeared my bike, where do i buy this 'Little Yellow Box'

[Dr Nick]

Well my chain and sprocket kit will turn up on Tuesday hopefully.

My speedo runs off of the front sprocket, so im assuming it will over read, by quite a bit, until i buy the sprocket guard that holds the speedo onto the sprocket, i wont have a speedo at all.

But where can i buy the 'Yellow Box' that corrects the speedo i assume? also where does it attach, and how much does it usually retail at?

Thanks
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is that it

[Bendy]

https://www.blackrobotics.com/order.htm

But have a look on ebay for someone selling 'speedo healers' - I got one for £20. Haven't fitted it yet, but it's basically the same thing as a yellow box and cheaper.

[Sparks!]

[swaffs]

hey Bendy, have you seen / noticed much differentce since d/g your bike?

[Bendy]

It's more fun now.

[Bendy]

[Sparks!]

[Dr Nick]

Thanks for the Replies
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is that it

[Demonic69]

Nick, PM Korn to see if he can remember that one on ebay
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Back on a Blade. Just feels so right.